9. How do we know whether or not global warming is caused by humans? From experiments in...

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Physics

9. How do we know whether or not global warming is caused byhumans?
From experiments in which a small experimental plot of forest issubjected to excess carbon, and the growth of the trees along withthe temperature are then measured.
From experiments in which excess carbon is injected into alaboratory-created Earth-like atmosphere, and the resultingtemperature is measured.
From computer calculations that \"predict\" 20th-centurytemperatures based on natural variations, then on human-causedvariations, and then on a mix of natural and human variations; theactual historical measurements then show that only naturalvariations are important.
From computer calculations that \"predict\" 20th-centurytemperatures, based on natural variations, then on human-causedvariations, and then on a mix of natural and human variations; theactual historical measurements then show the importance of humanvariations.
Actually, scientists have been unable to determine this.

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9 How do we know whether or not global warming is caused by humans Answer d option From computer calculations that predict 20thcentury temperatures based on natural variations then on humancaused variations and then on a mix of natural and human See Answer

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		From experiments in which a small experimental plot of forest issubjected to excess carbon, and the growth of the trees along withthe temperature are then measured.
		From experiments in which excess carbon is injected into alaboratory-created Earth-like atmosphere, and the resultingtemperature is measured.
		From computer calculations that \"predict\" 20th-centurytemperatures based on natural variations, then on human-causedvariations, and then on a mix of natural and human variations; theactual historical measurements then show that only naturalvariations are important.
		From computer calculations that \"predict\" 20th-centurytemperatures, based on natural variations, then on human-causedvariations, and then on a mix of natural and human variations; theactual historical measurements then show the importance of humanvariations.
		Actually, scientists have been unable to determine this.